<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>教材导航</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f5f5f5;
        }
         /* 标题样式 */
        .page-title {
           
            width: 100%;
            background-color: #3498db;
            color: white;
            text-align: center;
            padding: 10px 0;
            margin: 0;
            z-index: 1001;
           
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }

        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
        }

        .grade-list {
            list-style-type: none;
            padding: 0;
        }

        .grade-list li {
            margin: 10px 0;
            background-color: #fff;
            padding: 15px;
            border-radius: 5px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .grade-list a {
            text-decoration: none;
            color: #007bff;
            font-size: 18px;
            display: block;
        }

        .grade-list a:hover {
            color: #0056b3;
        }

        .grade-list .coming-soon {
            color: #6c757d;
            font-style: italic;
        }
    </style>
</head>

<body>
    <!-- 页面标题 -->
    <h1 class="page-title">电子课本在线阅读与下载</h1>
    <div class="container">
        <ul class="grade-list">
            <li><a href="primary_school.html">小学</a></li>
            <li><span class="coming-soon">初中（陆续更新中）</span></li>
            <li><span class="coming-soon">高中（陆续更新中）</span></li>
            <li><span class="coming-soon">大学（陆续更新中）</span></li>
        </ul>
    </div>
</body>

</html>